Creating files with some content with shell script
You can use a here document:
cat <<EOF >/home/a.configfirst linesecond linethird lineEOFYou can place several of these in the same script.
On OS-X the command should be:
cat > filename <<- "EOF"file contentsmore contentsEOF
file="/tmp/test.txt"echo "Adding first line" > $fileecho "Adding first line replaced" > $fileecho "Appending second line " >> $fileecho "Appending third line" >> $filecat $file> to add/replace the content ( here actual content got replaced by the 2nd line)
>> to append
Result
Adding first line replaced
Appending second line
Appending third line